E2E Utils: Add retry mechanism to the REST API discovery (#62331)

Co-authored-by: WunderBart <bartkalisz@git.wordpress.org>
Co-authored-by: kevin940726 <kevin940726@git.wordpress.org>
Co-authored-by: swissspidy <swissspidy@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: GraemeF <graemef@git.wordpress.org>

packages/e2e-test-utils-playwright/src/request-utils/rest.ts

@@ -3,6 +3,7 @@
  */
 import * as fs from 'fs/promises';
 import { dirname } from 'path';
+import { expect } from '@playwright/test';
 import type { APIRequestContext } from '@playwright/test';
 
 /**
@@ -39,10 +40,32 @@ async function getAPIRootURL( request: APIRequestContext ) {
 }
 
 async function setupRest( this: RequestUtils ): Promise< StorageState > {
-	const [ nonce, rootURL ] = await Promise.all( [
-		this.login(),
-		getAPIRootURL( this.request ),
-	] );
+	let nonce = '';
+	let rootURL = '';
+
+	// Poll until the REST API is discovered.
+	// See https://github.com/WordPress/gutenberg/issues/61627
+	await expect
+		.poll(
+			async () => {
+				try {
+					[ nonce, rootURL ] = await Promise.all( [
+						this.login(),
+						getAPIRootURL( this.request ),
+					] );
+				} catch ( error ) {
+					// Prints the error if the timeout is reached.
+					return error;
+				}
+
+				return nonce && rootURL ? true : false;
+			},
+			{
+				message: 'Failed to setup REST API.',
+				timeout: 60_000, // 1 minute.
+			}
+		)
+		.toBe( true );
 
 	const { cookies } = await this.request.storageState();
 

test/performance/playwright.config.ts

@@ -14,9 +14,7 @@ process.env.ASSETS_PATH = path.join( __dirname, 'assets' );
 
 const config = defineConfig( {
 	...baseConfig,
-	reporter: process.env.CI
-		? './config/performance-reporter.ts'
-		: [ [ 'list' ], [ './config/performance-reporter.ts' ] ],
+	reporter: [ [ 'list' ], [ './config/performance-reporter.ts' ] ],
 	forbidOnly: !! process.env.CI,
 	fullyParallel: false,
 	retries: 0,